\documentclass[tikz,convert=pdf2svg]{standalone}
\usepackage{tikz}
\begin{document}
    \begin{tikzpicture}
    [L1Node/.style={circle,   draw=blue!50, fill=blue!20, very thick, minimum size=10mm},
    L2Node/.style={rectangle,draw=green!50,fill=green!20,very thick, minimum size=10mm}]
       \foreach \x in {1,...,5}
        \node[L1Node] (w1_\x) at (2*\x, 0){$\int_\Omega x_\x$};
    \end{tikzpicture}
\end{document}